Mold for forming concrete silos.



O. A. ANDERSON. MOLD FOR FORMING CONCRETE SILOS.

APPLICATION FILED FEB. 24, 1909.

Patented Feb. 21,1911.

5 SHEBTS-SHEET 1.

O. A. ANDERSON. MOLD FOR FORMING CONCRETE SILOS. APPLICATION FILED FEB. 24, 1909.

Patented Feb. 21, 1911.

ti 5 SHEETS-SHEET 2.

' G. A. ANDERSON.

MOLD IOR FORMING CONCRETE SILOS. APPLICATION FILED FEB. 24, 1909.

439$ Patented Feb.21, 1911.

5 SHEETS-SHEET 3.

nuemtoz attoznags' 0. A. ANDERSON.

MOLD FOR FORMING CONCRETE SILOS.

. APPLICATION FILED FEB. 24, 1909.

Patented Feb. 21, 1911.

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MOLD FOR FORMING CONCRETE SILOS.

v APPLIOATION FILED P3124, 1909.

Patented Feb. 21, 1911.

5 8HEETS-SHEET 5.

UNITED STATES PATENT 'OFFlCE.

CLAUES A. ANDERSON, OF ST. CHARLES, ILLINOIS.

MOLD FOR FORMING CONCRETE SILOS.

Specification of Letters Patent. Patented Feb, 21, 1911.

Application filed February 24, 1909. 7 Serial No. 479,843.

ing Concrete Silos; and I do hereby d'eclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it .appertains to make and use the same.

My invention relates to molds for concrete structures especially designed for building silos. L

This apparatus belongs to the class. of molds in which are employed a .mast supported in the axis of the structure, a sleeve vertical'lymovable on the mast and guided thereby, armsextending outward from the sleeve, mold walls adjustably connected to the arms, and means for raising and supporting the sleeve, arms and mold walls step by step asthe work progresses.

The main -object of this invention is to improve previous molds of this type thereby producing one which is thoroughly practical and meets the demands of the trade in simplicity of construction and reduced cost of construction.

Subsidiary objects/"are to provide for securing greater rigidity of the mold walls so that they will not give'when the concrete is tamped; for constructing an external chute integral with the Walls of the silo, for securing greater safety in raising and lowering the mold; for making the walls more even and plumb, by preventing the mold from swinging" on the mast; for increasing the speed with whichthe mold may be moved from one stage to the next higher stage so that this operation can be performed in about ten minutes; for making the adjustment of the mold walls more accurate whereby the mold will be exactly the 45 same size at each stage; for securing greater convenience in placin the concrete. in the mold; for strengthening the mast thereby reducing chance of accident; for en porting. verticaireinforcing rods without interfering withplacing concrete in the mold; for placing horizontal reinforcing rings in the concrete so that they extend across the chute.

and prevent .the sides of said chute from spreading; and. for disconnecting the outer mold wall when the structure is completed, and lowering said outer mold wall at the outside and the inner mold wall, together with the sleeve and supporting arms, on the inside of the buildin ,after which the apparatus may be quic y taken apartand re moved.

The invention consists in the features of construction and combinations of devices which accomplish these objects and which are hereinafter described and claimed.

In the accompanying drawings, illustrating the/preferred embodiment of my inven tion: Figure 1 is an elevation of a concrete structure or silo formed by my mold, artly broken away to show. the horizonta and vertical reinforcing rods. Fig. 2 is a plan view ofthe mold. Fig. 3 is a vertical sectional view on the line m-w of Fig. 2, also showing a portion of concrete wall already molded. Fig. 4 is an enlarged sectional view of the mast taken above the radial arms supporting the mold walls and showing more particularly the mechanisnifor raising the sleeve. Fig. 5 is a vertical sectional view on the line y-y of Fig. 4:. Fig. 6 is a broken side view of the sleeve, mast and mechanism for raising the former-on the latter. Fig. 7 is an enlarged broken plan view of the outer end of oneof the radial arms showing the means of connecting it to the inner mold wall and also the means of connection between the inner mold wall and the outer mold wall. Fig. 8 is a broken side view showing the same parts. Fig. 9 is a detailed view of one of the brackets and the rings for supporting the vertical reinforcing -rods. Fig. 10 is an enlarged detailed view showing the hinge-connection between the lower edge of the inner mold wall and oneof the radial arms attached to the lower sleeve. Fig. 11 is an enlarged detailed view of the hinge-connection between said lower sleeve and the inner end of said arm, Figs. 12 and 13 are detailed views showing how the doors are fitted to the building, especially how the inner sectional door is secured to the portions of the horizontal reinforcing rods which extend across the chute. Fig. 1 L is a detailed viewof one of the spacing blocks used between the inner and outer mold walls. Fig. 15 is an enlarged vertical section on the line zz of Fig. 16 showing structions to hinder: the pouring and tampingof the concrete. Braces 60 are arranged .per edge of the outer mold wall.

brackets extend above the mold and over the I at to the bent outer edges 46 of the extensions 45, constitute continuations of the inner mold wall corresponding to said extensions ofthe outer mold wall. Said doors are provided with suitable latches 51 whereby they may be detachably securedto the ends of the inner mold wall. These latches may be raised and the doors swung outward when the mold is to be separated from a section of concrete wall already formed therein and raised to the next higher position. 1

Each of the doors 49 has. one or more slots 52 (two being shown in Fig. 3) in its inner edge to permit horizontal reinforcing rin s 53, placed at intervals in the concrete wall. to pass across the chute. have these rings 53 continuous and unbroken in order to prevent the concrete walls at each side of the chute from spreading under pressure of the contents of the building or silo. The opening of the doors will disengage these slots from said rings so that the latter will not interfere with the raising of the mold.

It has been found advantageous to place vertical reinforcing rods in the concrete wall 'as well as horizontal rings. To support the vertical rods 54, I provide brackets 55 preferably secured to the angle bar 43 atthe up- These space between the outer-and inner walls thereof. Said vertical reinforcing rods are adapted to be clamped between two halfrings 56 and 57, one of which is rigidly secured to the brackets .55, while the other is adjustablyconnected to the first one by means ofbolts .58arran' ed at suit-able intervals. By loosening t ese bolts 58, said half rings will be released from the vertical reinforcing rods and allow the, mo ld to be raised after which said half' rings. may be tightened again upon said-rods to hold them in proper position while the next section of concrete is being formed. prefer to use twisted reinforcing rods because they adhere better to the concrete.

Chains 59, or othersuitable flexible con nections are secured to .the upward extensions 10 of the angle irons arranged in the outer corners of the sleeve 5. These chains are designed to be attached to the upper ed e of the outer mold wall when the mold is eing raisedbut they are'detached there from and moved out of the way while the concrete is poured into. the mold and tamped. It willbe notedthat as the brackets 55, supporting-the vertical reinforcing rods, extend well above the mold, there are no obbelow the radial arms 6 and are connected to the'downward extensions 11 ofthe angle rings 53 which passes across the chute. The

It is essential to bars '9. A platform 60 is laid arossthe radial arms 6 to support the workmen. 111? operation, the concrete is dumped upon this platform and then transferred to the mold.

In Figs. 12 and 13, Ihave'illustrated how doors may be fitted to the chute. The inner door, as there shown, is made inseparately removable sections 61, each of which carries a pivoted latch 62 adapted to be turned down over the portion of one of the reinforcing outer door 63 may be hinged or arranged 'in any suitable manner.

The extremities of the upward and down- 7 Ward extensions 10 and 11 are braced by cross bars 64 running both ways, as shown in Figs. 15 and 16. 'To the bars 64 arranged at the sides of the mast not having the grooved racks, there are secured roller brackets 65 carrying rollers 66 which'fit in grooves 67 formed between the adjacent edges of theangle bars 2. These roller bearings insure free movement of the sleeve 5 on the mast and prevent said sleeve from twisting thereon. They also take strainofl of the worm shafts 12 and serve to hold them in proper alinement with the racks. The sleeve36 is also providedwith roller bearings 68 which engage the grooves 67 said rollers being mounted in slots 69 formed in said sleeve, as illustrated .in Figs. 11, 17 and 18. i

The construction of. my mold, as hereinbefore explained, is so simple that it may be disengaged from a sectionof molded concrete, raised and placed in position to form the next higher section in only about ten' minutes time. Before the mold is raised, by

-means of the worm shafts operated by the hand wheels 16, the, chains 59 are connected to the outer mold wall, the clamping rings 56 and 57 are loosened from the vertical reinfor'cing rods,- the inner and outer mold walls are respectively contracted and ,expanded by simply moving the lever-37 and giving the tie-rod 48 a. couple of turns, and the doors 49 are swung open. After the mold has been raised, the mold'walls are returned to their former ositions by moving the lever .37 and turning the tie-rod 48 in the opposite direction. The doors are then closed and latched, the clamping rings tightened upon" the vertical reinforcing rods,

- and the chains disconnected from the outer mold wall whereupon the mold is ready for formin the next sect-ion of concrete. It will be note that the-mold is not filled all the way up to the top but that the concrete stops below the spacing blocks, see Fig. 3. When the wall of the silo is completed, the outer mold wall or shell may be released from the inner mold wall by removing the spacing blocks and bolts on which they are mounted, said outer shell being then lowered to the j ground on'the outside of the building. The

' Wall, and means to -Ii1i1SlZ-QJ 2;.

' 2. The combination, with a mast, a sleeve inner shell can then be lowered on the inside of the 'building-by the hoisting apparatus after first retractin' the shoes 23 by means of: the levers 31. ymold, therefore, does iiot have to be taken apart up inthe air, as

is necessary in some previous constructions,

and which is a troublesome and perilous undertaking. I

Attention is-directed to the accuracy of adjustment which is obtained by my construction'. "When adjusted, the mold=w,ill be exactly the same size at eachposition throughout the construction of the entire wall. The use of the wormjshafts permits the hoisting mechanism and sleeve. carrying the same to be fitted closely aroundtl e mast thereby preventing the mold from swinging. and insuring a perfectlyplumbconcrete wall. ,The evenness ofsaid Wfiflishlso preserved by the rigidity of." the mold walls which are bracedat' the bottom as well as at the top so that, they do not-give whenthe concrete is tamp'ed'in the mold. I claim:

1. The combination,- withfiamast- H mounted to slide thereon; and rad al arms secured to said sleeve, of an inner mold wall Y fastened to saidqarms, anfouter' mold wall,

separate spacing blocks arranged between said 'walls, headed bolts 1 passed loosely through said walls and spacing ,blocks,xand normally extending beyond the outer. wall].

for the purpose specifiedmean'sito contract the, inner wall, means to expand-the outer raise said sleeve "on the "ounted to slide'thereonf, and radial arms cured to said-sleeve, of an inner mold wall ,fastened to said. arms, anz'outer-mold wall, separate spacing blocks arranged between -;1said walls, -hea'ded bolts passed loosely and ineans to raise 'saidsleeve oh-th mast- 3. The com'bination with a"mas t,';a=sleev,e f f mounte 'to slide' thereon, and ra'dialarms secured to said sleeve, of an inner .d' all "through said walls and spac1ng-blocks,'and

normally extending beyond the. outer; wall blockshavingdownward extension I lat-he ends which engagethefiinnel, wall or-the purpose specified, means, 0" ont-ractthe inner wall, means to expand-the otiter'jvall,

fastened to said arms, an outer suitably supported away from th wall, a second sleevej mounted to slide eiithe mast, radial" arm's hinged to 'Isaid{second sleeve anagram inner'wjall,

zongone of thearnis secure a c nnectmg' -rod giro ta -lever (mad by saidi- -latter sleeve may be raised the'outer wall, and means toe-raise eeve a. eve ffiyte t t eirs-s e e ,the" I inner wal lgis Simultaneously mamea on' all sides, means to expand the outerwall,

- and means to raise said sleeves together on said mast.

4. The combination,-with' amast, a sleeve mounted to slide thereon,fand-radial arms secured to said sleeve, of an inner mold wall loosely connected at its uppenedge to said arms, an outer mold Wall suitably supported and s aced away from the inner wall, a second s eeve mounted toslide on the mast,

radial arms hinged to said second sleeve and sleeve' fittedaroun-d said mast, worm shafts carried by said sleeve and meshing with said up}; bars, andmeans to turn said worm shafts, w th inner and outer mold walls, radlal arms mounted on said sleeve and supportingsaid walls, and-means to contract the innerwalland to expand the outer, wall.

6; The combination, ofa mast, grooved -rack bars arranged longitudinally of said mast, a sleevefitted around said mast, worm shafts carried-by said sleeve and meshin with said rack bars, and means to turn sai worm shafts, :with inner-and outermold walls, radial arm'smounted on said sleeve; and supporting said walls, and means to contract the inner wall and to. expand the outer wall.

7. The combination, of a mastcomposed i of a pluralityof timbers some of which ro-' ject beyond the others-forming longitudinal grooves, rack bars secured insaid grooves, a sleeve fitted around said mast, Worm shafts carried by said sleeveand meshing with said rack bars, and means-to turn said jworm "shafts, with inner and outer mold walls, radial arms mounted on said sleeve and supporting said walls, and means 'to contract the inner wall andlto expand the outer-wall. 1

8. Thecombination, of a mast, rack bars arranged longitudinally ,of'said mast, a sleeve fitted around said mast, worm shafts outer mold walls,v radia arms mounted on I carried by said sleeve and meshing with said i :rackbars, means to turn said worm shafts, {and v ratchet mechanism'to' lock said shafts against reverse. turnin with inner and said sleeve and supporting said walls, and v meansto contractthe inner Walland to expaud the outerwalll V t 9. The combination, of a-"mast, rack;bars arranged longitudinally of said must, a sleeve fitted around said mast, worm shafts carried by said sleeve-and meshing with:

i said rack bars, beveled pinions onsaid worm shafts, horizontal shafts zarrymg beveled pinions meshing with those on the worm shafts, hand wheels for turning said .horizontal shafts, with inner and outer mold walls, radial arms mounted on said sleeve and supporting said walls, and means to contract the inner wall and to expand the outer wall.

10. The combination, ofa mast, rack bars arranged longitudinally of said mast, a

sleeve fitted around said mast, worm shafts outer mold walls, radial arms mounted on said sleeve and supporting said walls, and

means to contract the inner wall and to expand the outer wall.

1-1. The combination, of a mast, rack bars arranged longitudinally of said mast, a sleeve fitted around said mast, worm shafts carried by said sleeve and meshing with said rack bars, beveled pinions' on said worm shafts, horizontal shafts carrying beveled pinions meshing with those on the worm shafts, hand wheels for turning said horizontal shafts, ratchet wheels on said horizontal shafts, and dogs pivoted on said sleeve and adapted to engage said ratchet wheels for the purpose specified, with inner and outer mold wal s, radial arms mounted on said sleeve and supporting said walls, and means to contract the inner wallv and to eXpandthe outer wall.

12. The combination,with an outer mold wall, of radial arms, each comprising a pair ofadjacent beams, a sectional inner mold wall the sections of which overlap between each pan of beams constituting one of said arms, and shoes havlng horizontal sliding wall sections whereby saidinner wallimiay by said arms, and means to raise said sleeve connection with the ends of said beams and I oblique sliding connection with-said inner be adjusted to change its diameter. 18. The combination, with an outer mold wall, of radial arms, each comprising a pair of adjacent beams, a sectional inner .mold

wall the'sections of whichoverlap between each pair of beams. constituting one of said w arms, shoes having horizontal sliding con nection with the ends of said beams and oblique sliding connection with'sa'id inner wall sections, and means'to slide'said shoes on said beams to change the diameter of said inner wallf 14:. The combination,-with a mast having grooves in opposite sides thereof, of a sleeve mounted to slide on said mast, upward and downward extensions of said sleeve, roller bearings carried by. said extensions and fitting the groves in the mast, radial arms secured to said sleeve, mold walls supported on the mast.

- 15. The combination, with a mast having grooves in opposite sides thereof, of-a sleeve mounted to slide 011 said mast, roller bear-- ings' carried by said sleeve and fitting the groove in the mast, radial arms secured-to said sleeve, inner and outer circular mold walls supported by said arms, a second sleev mounted around the mast, arms hinged to said second sleeve and to said inner mold wall, means to move saidsecond sleeve onthe mast relative to the first sleeve wher by said inner mold wall may be contracted, roller bearings carried bysaid second sleeve and fitting the grooves in the f CLAUES A; ANDERSON.

. Witnesses JOHN v A. BLOMQUEST, L. J.' JOHNSON. 

